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map_suite_wpf_desktop_edition_faq_labeling

Map Suite Wpf Desktop Edition FAQ Labeling

How can I display decimal degrees as degrees, minutes and seconds?

This question has a corresponding sample application(s) associated with it.

Sample:Decimal Degrees Formatting

The purpose of this project is to complete the static class DecimalDegreesHelper. This class offers functions to go to and from Decimal Degrees but it lacks the functions handling various formats such as Degrees Decimal Minutes and Degrees Minutes Decimal Seconds. Those formats can be output by different GPS devices and it is handy to know how to manipulate them and convert them to Decimal Degrees, the only format that can be input into a GIS or Mapping application.

How do I control how labels are displayed based on fields in the data?

This question has a corresponding sample application(s) associated with it.

Sample:Labeling Based On Columns

As a developer developing a mapping application, you may encounter point based shapefile for labeling. All the characteristics for labeling such as font, size, angle, color can be found in the attribute information of the shapefile itself. This project will show how to create a custom TextStyle that will get the value for those different columns and display each feature accordingly.

How do I adjust the size of the labels based on feature column data?

This question has a corresponding sample application(s) associated with it.

Sample:Labeling based on size

In the sample app “Draw thematic features” of the “How Do I” samples, we show how to use the ClassBreakStyle to display countries based of what population range they belong to. In today’s project, we show some more advanced uses of ClassBreakStyle to show how to label countries based on the area. You will notice that we also take advantage of the various zoom level sets for labeling purposes. The result is an eyed pleasing labeling of the countries with the size proportional to the countries’ area with more labels of smaller countries appearing as you zoom in.

How do I use multiple columns in one label?

This question has a corresponding sample application(s) associated with it.

Sample:Multi Column Labeling

In this project, we show some techniques to label features based on various columns. With the CustomStyles property and CustomColumnFetch event, you will see the flexibility you have to label the way you desire in a few lines of code. In this example, we label volcanoes based on four columns on two lines and using two different font styles.

How do I display multi labels for a given feature?

This question has a corresponding sample application(s) associated with it.

Sample:Multiple Labels

This sample shows how you can display multiple labels for a given point or feature. You can do this by setting a single TextStyle or multiple TextStyles. If you use a single TextStyle, you can simply use a pattern like “ColumnName1[ColumnName2]” and when Map Suite displays the text it will combine the values of the columns in your pattern. If you use a different styling method, you will need to manually control the offset of each piece of text to avoid overlapping.

For more information you can see the discussion forum post below: http://gis.thinkgeo.com/Support/DiscussionForums/tabid/143/aff/21/aft/6955/afv/topic/Default.aspx

How do I drag the labels to place them at the desired location?

This question has a corresponding sample application(s) associated with it.

Sample:Draggable Labels

In this wpf project, we are going to show how to place labels from a shapefile into a SimpleMarkerOverlay. Using the DragMode property of the SimpleMarkerOverlay, the user can then drag the labels to place them at the desired location for the most pleasing labeling effect. This project will be later completed to show how to save the state of the dragged labels from the SimpleMarkerOverlay and reload them.

How do I display multi line labeling?

This question has a corresponding sample application(s) associated with it.

Sample:MultiLine Labeling

For labeling purpose, TextStyle has a property called LabelAllPolygonParts that will label all the parts making up a polygon based feature. Unfortunately, we don’t have an equivalent API for labeling all the parts of a line based feature. But thanks to the flexible framework of Map Suite, we show in this Wpf sample how easily you can expand the TextStyle class to allow this labeling capability. Look at the custom class MultiLinetextStyle and how DrawCore function is overridden to have the expected labeling behavior.

map_suite_wpf_desktop_edition_faq_labeling.txt · Last modified: 2015/09/08 03:40 by admin